I was hoping if someone could recommend a good product for a mosaic ceramic tile roof that is leaking into the building. Obviously, the best thing is to treat anything underneath, but this is an extremely detailed and ornate roof that needs to be preserved.

We have tried a lot of different options in the past, but the sun usually degrades it over a few months, and the leaks never really stop. But the sealers help.

Is there a good sealer you guys have used/ can recommend that can stand up to UV degradation and can really stop leaks?

I agree with Fred-its the install-can you send some pics sounds like an interesting roof. Sealers aren't waterproofing . Their only performance is to temporarily inhibit the intrusion of staining agents.

It's truly a thing a beauty, but as far as I know there is no way to permanently stop the leaking without removing the tile. Whatever was used as waterproofing under the tile has apparently degraded. There's a good chance it's nothing more than asphalt roofing.

Without removing the tile and dealing with the waterproofing below I would think the only remedy would be the UV resin and flooding the entire roof with it to create a waterproof membrane that is transparent with the tiles visible thru it. Will take some serious skills and the detailing at transitions, edges, gutters, vents, etc will be difficult.